WO2012083949A1 - Dispositif d'adaptation de tension d'entrée - Google Patents

Dispositif d'adaptation de tension d'entrée Download PDF

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Publication number
WO2012083949A1
WO2012083949A1 PCT/DK2011/000149 DK2011000149W WO2012083949A1 WO 2012083949 A1 WO2012083949 A1 WO 2012083949A1 DK 2011000149 W DK2011000149 W DK 2011000149W WO 2012083949 A1 WO2012083949 A1 WO 2012083949A1
Authority
WO
WIPO (PCT)
Prior art keywords
electric
circuit arrangement
electric circuit
input sections
voltage
Prior art date
Application number
PCT/DK2011/000149
Other languages
English (en)
Inventor
Uffe Borup
Frerk Haase
Original Assignee
Danfoss Solar Inverters A/S
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Danfoss Solar Inverters A/S filed Critical Danfoss Solar Inverters A/S
Publication of WO2012083949A1 publication Critical patent/WO2012083949A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Definitions

  • transformers are used to increase the voltages, before the generated electric current is introduced into a wide area electric grid.
  • Such transformers are also galvanically isolating.
  • Such systems are described in the German utility model DE 20 2006 008 936 U1 , in the US patent application US 2009/0101191 A1 , in the European patent EP 2 136 449 B1 and in the international publication WO 2010/051812 A1.
  • a simple embodiment, relying on this effect, can be achieved by simply setting an appropriate part of the photovoltaic power plant to ground potential by grounding.
  • a preferred embodiment can be achieved if the electric circuit arrangement is designed in a way that a negative part of at least one of said electric input sections is at least in part and/or at least at times set to ground potential, in particular if thin-film photovoltaic cells are connected to said electric input section and/or if a positive part of at least one of said electric input sections is at least in part and/or at least at times set to ground potential, in particular if certain designs of back-contacted photovoltaic cells are connected to said electric input section.
  • This way it is possible to avoid adverse conditions for the respective types of photovoltaic cells.
  • degradation effects in particular with respect to a thin-film photovoltaic cell
  • polarisation effects in particular with respect to back-contacted photovoltaic cells
  • the "and” can particularly refer to a DC-DC-converter that can both raise and lower the voltage, where the "direction" of the voltage correction can be set depending on the requirements existing at a particular time.
  • a controllable voltage source device This can be in particular a controllable DC voltage source.
  • the voltage of the controllable voltage source device can be set by the electric circuit arrangement according to the actual needs. It is possible that the controllable voltage source device forms the input for at least one of the input sections of the electric circuit arrangement. Since the controllable voltage source device has to provide essentially only a specified voltage (with a usually negligible current), this can be a very elegant way to provide the suggested voltage adaption.
  • the arrangement is arranged in a way that at least one of said regulating devices is regulating the at least one regulated electric input section at least in part and/or at least at times in a way that the majority, preferably essentially all parts of the electric input sections are above or below ground potential, in particular above or below a certain potential above or below ground potential, respectively.
  • This way adverse effects for the photovoltaic cells cannot only be avoided for (presumably comparatively small) parts of the electric circuit arrangement and for (parts of) the components, connected thereto, but instead for the majority or (essentially) all parts of the electric circuit arrangement and the components connected thereto.
  • cells/photovoltaic modules can be arranged in a way that at least two
  • the respective inverter for changing the "initial" output voltage of the respective photovoltaic cell(s)/photovoltaic module(s)/photovoltaic subgroup to a different voltage (which can be the same, can be higher (in particular slightly higher) and/or lower (in particular slightly lower) than the "initial" input voltage. Therefore, the voltages that are leaving the regulating device (in particular DC-DC-converter and/or maximum power point tracking device) can be adapted to each other. In particular, if DC-DC-converters are used, normally a "step down"-adaption of the voltage (i.e.
  • the adaption does not necessarily mean that all voltages will be set to the same voltage (spread/level). Instead, it is in particular possible that the voltage (spread/level) and/or the subgroups that is/are grounded (or set at a specified potential with respect to ground potential) is/are selected in a way that (in particular through the partial electric connection by transformerless inverters) essentially all relevant parts of the (such connected parts of a) solar power plant are set at an advantageous level with respect to ground potential (in particular above and/or below ground potential, depending on the type of photovoltaic cells used, on safety considerations etc.).
  • Fig. a photovoltaic power plant in a schematic view from above;
  • Fig. 2 examples of possibly occurring potentials at one of the subunits 2, 3, 4 are shown (for example subunit 2).
  • different "grounding methods" are shown in the different sub figures 2a, 2b, 2c, 2d of Fig. 2, different "grounding methods" are shown.
  • the potentials of the two electric contacts 8 of each solar module 5 in one of the subunits 2, 3, 4 is shown in one of the subunits 2, 3, 4 (for example subunit 2) is shown.
  • the potential (voltage) with respect to ground potential is drawn for each of the solar modules 5.
  • the difference between the two electric conductors 8 in each electric input circuit 7 is indicating the voltage, generated by the respective solar module 5.
  • each electric input circuit 7 i.e. the voltages produced by the solar modules 5 are differing by a certain amount, say by approximately 20%. Furthermore, the potential with respect to ground potential (identical to the ordinate 19 line) will vary between the different electric input circuits 7 as well.
  • the determination of the input section 7 to be grounded (or that is to be set at a specified level with respect to ground potential) is preferentially done based on a (comparatively) recent/current measurement. Furthermore, the choosing of the input section 7 is performed (essentially) automatically. This way, user intervention can be minimised and/or a system with a particularly high lifetime can be realised in an easy way.
  • FIG. 3 another possible circuit arrangement 22 is shown that is particularly useful for performing comparatively large voltage adaptions.
  • two different solar units 23 are shown.
  • Each solar unit 23 comprises a plurality of (fixed) solar cells 6.
  • a "standby" solar cell 24 is provided. This standby solar cell 24 can be added to one of the two solar units 23a, 23b using the electric switches 25.
  • the electric switches 25 are presently drawn as electric relays, different embodiments are possible as well.
  • the "standby” solar cell 24 is included in series with the "left” solar unit 23a.
  • the “right” solar unit 23b is connected to a bypass cable 26. Therefore, the "left” solar unit 23a is “boosted” in voltage, while the “right” solar unit 23b remains unchanged.
  • By an appropriate switching of the electric switches 25, a reverse situation can be achieved. Also, it is possible that both solar units 23a, 23b will bypass the "standby” solar cell 24 (in this situation the "standby” solar cell 25 will be unused).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

L'invention concerne un agencement de circuit électrique (2, 3, 4) pour une installation d'énergie photovoltaïque (1), comprenant au moins deux sections d'entrée électriques (9), au moins une section de sortie électrique (12, 14) et au moins un dispositif régulateur (10, 11, 25), les deux sections d'entrée électriques (9) étant au moins par moment au moins en partie couplées électriquement l'une à l'autre par ledit agencement de circuit électrique (2, 3, 4). La tension électrique d'une section régulée parmi lesdites sections d'entrée électriques (9) est régulée par au moins un desdits dispositifs régulateurs (10, 11, 25) au moins en partie et/ou au moins par moment selon la tension d'au moins une section régulatrice parmi lesdites sections d'entrée électriques (9).
PCT/DK2011/000149 2010-12-21 2011-12-19 Dispositif d'adaptation de tension d'entrée WO2012083949A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA201001152 2010-12-21
DKPA201001152 2010-12-21

Publications (1)

Publication Number Publication Date
WO2012083949A1 true WO2012083949A1 (fr) 2012-06-28

Family

ID=45531703

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK2011/000149 WO2012083949A1 (fr) 2010-12-21 2011-12-19 Dispositif d'adaptation de tension d'entrée

Country Status (1)

Country Link
WO (1) WO2012083949A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102769285A (zh) * 2012-08-08 2012-11-07 北方工业大学 Pv模块并联阵列及其实现电压自动跟踪的方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1447527A (en) * 1972-10-20 1976-08-25 Acec Apparatus for regulating the voltage of an electric source
DE202006008936U1 (de) 2006-06-07 2006-08-17 Sma Technologie Ag Schaltung zur Erhöhung der Lebensdauer von PV-Generatoren
US20090101191A1 (en) 2007-10-23 2009-04-23 Adensis Gmbh Photovoltaic system
EP2136449B1 (fr) 2008-06-19 2010-02-10 SMA Solar Technology AG Centrale solaire
WO2010051812A1 (fr) 2008-11-07 2010-05-14 Danfoss Solar Inverters A/S Centrale photovoltaïque possédant une source de tension de décalage commandant le potentiel de courant continu à la sortie de l’inverseur

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1447527A (en) * 1972-10-20 1976-08-25 Acec Apparatus for regulating the voltage of an electric source
DE202006008936U1 (de) 2006-06-07 2006-08-17 Sma Technologie Ag Schaltung zur Erhöhung der Lebensdauer von PV-Generatoren
US20090101191A1 (en) 2007-10-23 2009-04-23 Adensis Gmbh Photovoltaic system
EP2136449B1 (fr) 2008-06-19 2010-02-10 SMA Solar Technology AG Centrale solaire
WO2010051812A1 (fr) 2008-11-07 2010-05-14 Danfoss Solar Inverters A/S Centrale photovoltaïque possédant une source de tension de décalage commandant le potentiel de courant continu à la sortie de l’inverseur

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102769285A (zh) * 2012-08-08 2012-11-07 北方工业大学 Pv模块并联阵列及其实现电压自动跟踪的方法

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